Delete row sig_779a2b182eeb from signals

id sig_779a2b182eeb
event_id evt_155697dfd484
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T07:12:56.588686+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:71dbfd9bd6b67888
throttle_s 0
created_at 2026-04-19T07:12:56.588686+00:00
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